AS1163 C250 is a steel grade of hollow section steels specified in the AS/NZS 1163 standard. And, AS/NZS 1163 is the Australian and New Zealand standard for cold-formed structural steel hollow sections. These sections are normally electric resistance welded and are used for structural purposes and engineering applications. There are three main steel grades specified, with or without impact properties, which vary in yield strength and tensile strength. It is important to note that the standard applies to both welded and seamless hollow sections in circular, square, and rectangular shapes. The AS/NZS 1163 standard is an important tool for engineers when specifying the required properties of cold-formed structural steel hollow sections.
How do distinguish AS1163 C250 from other steel grades? The nominal minimum yield strength of hollow sections is used to determine the grade classification (in MPa). The prefix “C” is used before the value of the nominal yield strength of the steel to indicate that the section is cold-formed. Only cold-formed structural steel hollow sections are covered by AS/NZS 1163. Also, if the number is followed by a suffix “L0”, this steel grade must meet the impact test requirements. As a result, AS1163 C250 means cold-formed structural steel hollow sections with 250 MPa minimum yield strength, and no impact test required.
Why choose tuspipe?
Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.
With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.
TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality, the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.
Dimensions and Sizes of AS1163 C250 Pipe
|Outside Diameter||Thickness||Mass per Unit Length||Outside Diameter||Thickness||Mass per Unit Length|
|O . D .||W . T .||Weight||O . D .||W . T .||Weight|
|mm||mm||kg / m||mm||mm||kg / m|
Chemical Composition of AS1163 C250 Pipes
Sampling from AS1163 C250 materials for chemical analysis is a vital step in ensuring the accuracy of the results. The method of sampling shall be in accordance with AS/NZS 1050.1 or ISO 14284, and the composition shall be determined in accordance with AS/NZS 1050 series Standards or other procedures that achieve the same, or better, degree of accuracy. This ensures that the results are accurate and reliable. Chemical analysis is an important tool for many industries, and it is essential that the results are as accurate as possible. By following the correct sampling procedures, we can ensure that the results are reliable and informative.
|Grades||Chemical Composition of AS1163 C250 materials (Cast or product analysis) % max.|
Mechanical Properties of AS1163 C250 Materials
When it comes to understanding the strength and durability of AS1163 C250 materials, there are three key tests that engineers rely on: the tensile test, the impact test, and the flattening test. The tensile test measures a material’s ability to withstand forces that try to pull it apart, such as the stresses that occur during welding. The impact test assesses a material’s resistance to shattering forces, such as those that can occur during a car crash. And the flattening test gauges a material’s ability to resist crushing forces, such as those that might be exerted by heavy machinery. By understanding the results of these tests, engineers can ensure that AS/NZS 1163 C250 materials will be able to stand up to the rigors of their intended applications.
- AS/NZS 1163 C250 Tensile Test Requirements
|Grade||Minimum yield strength MPa||Minimum tensile strength MPa||Minimum elongation as a proportion of the gauge length of 5.65√S。( see Note )%|
|Circular hollow sections d0 / t||Rectangular hollow sections b / t , d / t|
|NOTE : These limits apply to the face from which the tensile test is taken . That is , for RHS , the use of b / t or d / t ratio is dependent on which face the test specimen is cut from . For SHS , there is only one ratio ( as b = d ).|
- AS/NZS 1163 C250 Charpy V-Notch Impact Test Requirements
|CHARPY V – NOTCH IMPACT TEST REQUIREMENTS|
|Grade||Test temperature ℃||Minimum absorbed energy , J|
|Size of test piece|
|10 mm x10 mm||10 mm x 7.5 mm||10mmx5mm|
|Average of 3 tests||Individual test||Average of 3 tests||Individual test||Average of 3 tests||Individual test|
|C250LO C350L0 C450LO||0||27||20||22||16||18||13|
The tolerances of AS1163 C250 Standard
The tables given below show the dimensional and mass tolerances for AS1163 C250 cold-formed hollow sections. The first table is for shape and mass, while the second is for length. As can be seen, the tolerances are relatively tight, especially for mass. This is due to the fact that hollow sections are often used in load-bearing applications, and even small deviations from the nominal dimensions can lead to significant changes in performance. As a result, it is important to ensure that cold-formed hollow sections meet the tolerances given in the tables below. Doing so will help to ensure that they perform as intended and do not fail prematurely.
- AS/NZS 1163 C250 Tolerance for Shape and Mass
|Characteristic||Circular hollow sections||Square and rectangular hollow sections|
|External dimensions ( do , d and b )||±1%, with a minimum of ±0.5 mm and a maximum of ±10 mm||±1%, with minimum of ±0.5 mm|
|Thickness ( t )||For do ≤406.4 mm :±10% For do >406.4 mm :±10% with a max of ±2 mm||±10%|
|Out – of – roundness ( o )||±2% for hollow sections having a diameter to thickness ratio not exceeding 100( see Note 1)||–|
|Concavity / convexity ( see Note 2)||–||Max .0.8% or 0.5 mm , whichever is greater|
|Squareness of sides||–||90°±1°|
|External corner profile||–||See Table 5|
|Twist ( v )||–||2 mm +0.5 mm / m length|
|Straightness ( see Note 3)||0.20% of total length||0.15% of total length|
|Mass ( m ) per unit length||Not less than 0.96 times the specified mass ( Note 4) on individual lengths|
|NOTES : 1 Where the diameter to thickness ratio exceeds 100, the tolerance on out – of – roundness becomes the subject of agreement between the manufacturer and purchaser . 2 The tolerance on convexity and concavity is independent of the tolerance on external dimensions . 3 The straightness tolerance applies to straightness in any one plane . 4 In lieu of any other requirement , the specified mass is considered to be the nominal mass as noted in Clause 15.|
- AS/NZS 1163 C250 Tolerance on Length
|Type of length||Range mm||Tolerance|
|Random length||4000 to 16000 with a range of 2000 per order item||10% of sections supplied may be below the minimum for the ordered range but not less than 75% of the minimum|
|Mill ( or ‘ unspecified ‘) length||All||+100 mm -0|
|Precision length||<6000||+5 mm -0|
|≥6000≤10000||+15 mm -0|
|>10000||+5 mm +1 mm / m -0|
|NOTE : The enquiry and order shall indicate the type of length required and the length or length range , as appropriate . Alternatively , length tolerances shall be specified at the time of order .|
AS/NZS 1163 C250 AND API 5L Gr. B Dual Specs Pipes
There is a high demand for dual-spec pipes, such as AS1163 C250 / API 5L Gr. B materials. To demonstrate conformity with these materials requirements, we conduct a number of mechanical/chemical tests. To ensure compliance with tensile and fracture toughness requirements, API 5L and AS/NZS 1163 each need separate test methodologies. To establish structural and pressure integrity, hydrostatic pressure tests and non-destructive weld inspection are also done.